Cryostats and Dewars are a collection of general purpose units for immersion cooling of samples or by contact.  Included in this series is the cooling of super-conducting magnets and a variety of other uses including: X-ray and neutron diffraction, optical studies, NMR spectroscopy, XRS and others.  Coming in different sizes and shapes they are available for use with nitrogen, helium, and non-nitrogen shielded helium.

Units are manufactured from light weight aluminum or from rugged stainless steel.  Fiberglass, super-insulation and other low thermal conductivity items are used to minimize heat loss.  Common to all units are: evacuation valves, vacuum casing burst disc, standard fill / vent fittings, heliarc welding, mass spectrometer testing to 1 x 10-9 cc/sec., and design of inner and outer vessels to withstand external pressures of 60 psi in collapse.

Bucket Dewars:

Available in nitrogen or non-nitrogen shielded versions.  Units are constructed of heliarc welded aluminum and low thermal conductivity fiberglass to minimize conductive heat leak.  Other standard features include super-insulation, evacuation valve, and vacuum casing burst disc.  Foam neckplugs with relief valves and standard fill/vent fittings are available as an option. We specialize in building to the end-users requirements.

21-6004 21-6905 21-8016 21-6906 Diameter                  Inches 12 12 15 21 Height                       Inches 58 48 3/4 52 67 Inside Depth Inches 54 45 3/4 48 62 Neck ID   Inches 6 1/2 8 1/8 10 15 Helium Capacity Liters 18 24 60 120 Nitrogen Capacity   Liters  12 16 14 25

Belly Dewars:

 Derived from the "bucket" series, the Belly Dewars feature an enlarged mid-section for increased capacity and operating time.  Non-nitrogen shielding is standard to reduce noise from  the boiling liquid in applications such as a dilution refrigerator. Our advanced, computer optimized, thermo-shielding system provides superior thermal performance.  Primarily made from aluminum with a fiberglass necktube, these units are complete with evacuation valve, burst disc and lifting lugs..

Controlled Temperature Cryostats - Model #31-4000:

A liquid nitrogen shielded, liquid helium cryostat, which is principally designed for the collection of neutron diffraction data.  The temperature of the sample mounting surface may be varied from 5 to 300K with temperature regulation of + or - 0.10K with the use of appropriate sensors.  The sample is mounted in the vacuum space. Applications include X-ray and neutron diffraction, spectroscopy, and other optical and nuclear studies.  Special tail configurations are available with or without optics.

Controlled Temperature Cryostats -Model #31-1001:

A super-insulated, liquid nitrogen shielded, liquid helium cooled, control temperature cryostat that may use liquid nitrogen for cooling as well.  Interchangeable tail configurations make this quality unit fill the need of several "simple application" units.  Temperature control is similar to Model 31-4000. Applications include neutron or X-ray diffraction, thermal conductivity, infrared, and other optical studies.